<template lang="">
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item :to="{ path: '/categories' }"><a href="/">商品管理</a></el-breadcrumb-item>
            <el-breadcrumb-item>商品参数</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <el-alert show-icon type="error" title="注意：只允许为第三季分类设置相关参数!" :closable="false">

            </el-alert>

            <el-row class="select-cate">
                <el-col :span="24">
                    <span>选择商品分类</span>
                    <!-- 级联选择框 -->
                       <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" 
                       :show-all-levels="false"
                       v-model="selectCate"
                       @change="handleChange" >
          </el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签区域 -->
            <el-tabs v-model = "activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary"
                    :disabled="isBtnDisabled"
                    @click="showAdd">添加参数</el-button>

                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe style="margin-top:10px">
                        <!-- 展开行 -->
                         <el-table-column type="expand">
                             <template slot-scope="props">
                                <!-- 循环渲染Tag标签 -->
                                <div>
                                    <el-tag v-for="(item, i) in props.row.attr_vals" :key="i" closable @close="handleClose(i, props.row)">{{item}}</el-tag>
                                    <!-- 输入文本框 -->
                                    <el-input class="input-new-tag" v-if="props.row.inputVisible" v-model="props.row.inputValue" 
                                    ref ="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(props.row)" @blur="handleInputConfirm(props.row)">
                                    </el-input>
                                          <!-- 添加按钮 -->
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(props.row)">+ New Tag</el-button>
                                </div>
                             </template>
                         </el-table-column>
                        <el-table-column type="index"></el-table-column>
                         <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                         <el-table-column label="操作">
                             <template slot-scope="props">
                                 <el-button type="primary" size ="mini" icon="el-icon-edit"
                                 @click="showEditDialog(props.row.attr_id)">编辑</el-button>
                                 <el-button type="danger" size ="mini" icon="el-icon-delete" @click="removeParams(props.row.attr_id)">删除</el-button>
                             </template>
                         </el-table-column>
                    </el-table>
                </el-tab-pane>
                  <!-- 添加静态属性的面板 -->
                   <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" :disabled="isBtnDisabled"
                     @click="showAdd">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe style="margin-top:10px">
                        <!-- 展开行 -->
                         <el-table-column type="expand">
                            <template slot-scope="props">
                                <!-- 循环渲染Tag标签 -->
                                <div>
                                    <el-tag v-for="(item, i) in props.row.attr_vals" :key="i" closable @close="handleClose(i, props.row)">{{item}}</el-tag>
                                     <!-- 输入文本框 -->
                                    <el-input class="input-new-tag" v-if="props.row.inputVisible" v-model="props.row.inputValue" 
                                    ref ="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(props.row)" @blur="handleInputConfirm(props.row)">
                                    </el-input>
                                          <!-- 添加按钮 -->
                                    <el-button v-else class="button-new-tag" size="small" @click="showInput(props.row)">+ New Tag</el-button>
                                </div>
                             </template>
                         </el-table-column>
                        <el-table-column type="index"></el-table-column>
                         <el-table-column label="属性名称" prop="attr_name"></el-table-column>

                         <el-table-column label="操作">
                            <template slot-scope="props">
                               <div>
                                   <el-button type="primary" size ="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" size ="mini" icon="el-icon-edit" @click="removeParams(scope.row.attr_id)">删除</el-button>
                               </div>
                            </template>
                            </el-table-column>

                    </el-table>
                </el-tab-pane>

            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
          <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
       <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 修改参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
    </div>
</template>


<script>
export default {
    data(){
        return{
            //商品分类列表
            catelist:[],
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            selectCate:[],
            //被激活的页签名称
            activeName:'many',
            //动态参数数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加框和对话框的显示隐藏
            addDialogVisible:false,
            //修改的表单数据对象
            addForm: {
                attr_name:''
            },
            addFormRules:{
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
            },
            //控制修改对话框的现实隐藏
            editDialogVisible:false,
            //修改表单数据对象
            editForm:{},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                    ]
            }
        }
       
    },
     methods: {
         async getCateList(){
             const {data: res} = await this.$http.get('categories',{
                 params:{
                     type:3
                 }
             })
             if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
             this.catelist = res.data
         },
         handleChange(){
           this.getParamsData()
         },
         handleTabClick(){
             console.log(this.activeName)
             this.getParamsData()
         },
         //获取动态数据和静态属性
          async getParamsData(){
               //证明选中的不是三级分类
            if(this.selectCate.length <3){
                this.selectCate = []
                this.onlyTableData = []
                this.manyTableData= []
                return 
             }
             //根据所选分类id和当前所处的面板获取对应的参数
             const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})

             if(res.meta.status !==200){
                 return this.$message.error('获取参数失败')
             }

             
            res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                    //控制文本框的现实与隐藏
                    item.inputVisible = false
                    //文本框中输入的内容
                    item.inputValue = ''
            })
             console.log(res.data);
             if(this.activeName ==='many'){
                 this.manyTableData = res.data
             }else{
                 this.onlyTableData = res.data
             }
       
         },
         //弹出添加对话框
         showAdd(){
             this.addDialogVisible=true;
         },
        // 重置添加参数的表单
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //重置修改表单
    editDialogClosed(){
    this.$refs.editFormRef.resetFields()
    },
    addParams(){
        this.$refs.addFormRef.validate(async (valid) =>{
            if(!valid) return
                const { data :res} = await this.$http.post (`categories/${this.cateId}/attributes`,
       
          { attr_name: this.addForm.attr_name, 
            attr_sel: this.activeName })
                if(res.meta.status !==201) return this.$message.error(res.meta.msg)
                //添加参数成功
                this.$message.success(res.meta.msg)
                this.getParamsData()
                this.addDialogVisible = false
            
        })
    } ,
    //点击按钮 修改参数信息
     editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }

        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    async showEditDialog(attr_id){
        //查询当前参数的信息
        const{ data:res} =await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
            params:{ attr_sel:this.activeName }
        })

        if(res.meta.status !==200){
            return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data
        this.editDialogVisible = true
    },
    //根据Id删除对应的参数项
    async removeParams(attr_id){
         const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      //用户取消了删除操作
      if(confirmResult !== 'confirm'){
          return this.$message.info('已取消删除！')
      }
      //删除的业务逻辑
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        
        if(res.meta.status !== 200){
            return this.$message.danger('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
    },
    // 文本框失去焦点，或摁下了 Enter 都会触发
    async handleInputConfirm(row){
         if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //用户输入了真实内容
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
    //   发送请求传给后端保存添加的属性
     this.saveAttVals(row)

    },    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //将对attr_vals的操作保存为一个函数
    async saveAttVals(row){
    const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }

      this.$message.success('修改参数项成功！')
    },
    //删除对应的参数可选项
    handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttVals(row)
    }

    },
    created(){
        this.getCateList()
    },
    computed:{
        //若果按钮需要禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectCate.length ===3){
                return false;
            }else{
                return true;
            }
        },
         cateId(){
             if(this.selectCate.length === 3){
                 return this.selectCate[2]
             }
             return null
         },
         titleText(){
             if(this.activeName ==='many'){
                 return '动态参数'
             }else{
                 return '静态属性'
             }
         }
         
         
    }
}
</script>

<style lang="less" scoped>
    .select-cate{
        margin-top:20px;
    }
    .el-cascader {
        margin-left: 10px;
    }
    .input-new-tag{
        width:120px;
    }
</style>